Which is true for any ratio $a:b$ where $a, b 0$?

Question

Which is true for any ratio $a:b$ where $a, b > 0$?

Accepted Answer

$a:b = ka:kb$ for any $k > 0$

Answer

$a:b = b:a$

Answer

$a:b$ depends on the unit chosen

Answer

$a:b = a-b$

Which is true for any ratio a:ba:ba:b where a,b>0a, b > 0a,b>0?